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The lens in the adult human eye blocks nearly 100 percent of the sun's UV rays. As part of the normal aging process, the eye's natural lens eventually blocks some short-wavelength blue light as well â the type of blue light most likely to cause damage to the retina and lead to macular degeneration and vision loss.
Interesting question. It, of course, would depend upon the exposure time and the intensity of the radiation. I'm not an expert in radiation effects on the eye. But from what I know, it would be more likely that retinal effects in the back of your eye would cause more damage than iris effects in the front part.